Joint Ventures and Investments - Consolidated Joint Ventures (Parenthetical) (Detail) - USD ($) $ in Thousands		1 Months Ended					3 Months Ended		6 Months Ended	9 Months Ended
		Sep. 30, 2020		Jul. 31, 2020	Jul. 31, 2019	Jun. 30, 2018	Sep. 30, 2020		Jun. 30, 2020	Sep. 30, 2020
Schedule Of Investments [Line Items]
Payments to acquire ownership interest										$ 2,750
Umbro China Limited
Schedule Of Investments [Line Items]
Percentage of company ownership		0.00%	[1]		100.00%		0.00%	[1]		0.00%	[1]
Gain on sale of equity investments				$ 59,600			$ 59,600
Umbro China Limited | MHMC
Schedule Of Investments [Line Items]
Ownership interest acquired					5.00%
Payments to acquire ownership interest					$ 1,300
Starter China Limited
Schedule Of Investments [Line Items]
Percentage of company ownership	[2]	0.00%					0.00%			0.00%
Gain on sale of equity investments		$ 14,500					$ 14,500
Description of completed date of sale										Company completed the sale of Starter China in September, 2020
Danskin China Limited
Schedule Of Investments [Line Items]
Percentage of company ownership	[3]	90.00%					90.00%			90.00%
Danskin China Limited | Li Ning Sports (Hong Kong) Company Ltd
Schedule Of Investments [Line Items]
Percentage of equity ownership interest sold									10.00%
Sale of ownership interest									$ 1,600
Lee Cooper China Limited
Schedule Of Investments [Line Items]
Percentage of company ownership	[4]	100.00%					100.00%			100.00%
Lee Cooper China Limited | POS Lee Cooper HK Co. Ltd
Schedule Of Investments [Line Items]
Number of days expected for initial purchase to commence						45 days
Additional percentage of ownership interest sold						10.00%
Lee Cooper China Limited | POS Lee Cooper HK Co. Ltd | Minimum
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary						50.00%
Lee Cooper China Limited | POS Lee Cooper HK Co. Ltd | Maximum
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary						60.00%
Lee Cooper China Limited | POS Lee Cooper HK Co. Ltd | Sale Agreement Over Four-Year Period within 45 Days from October 15, 2020
Schedule Of Investments [Line Items]
Cash consideration from sale of equity interest						$ 8,200
Lee Cooper China Limited | POS Lee Cooper HK Co. Ltd | Sale Agreement Over Two-Year Period from January 15, 2024
Schedule Of Investments [Line Items]
Cash consideration from sale of equity interest						$ 2,500
Percentage of royalty received as consideration						2.50%

[1] In July 2019, pursuant to the operating agreement, the Company reacquired the remaining 5% ownership interest in Umbro China from MHMC, its joint venture partner, for approximately $1.3 million, which resulted in the Company owning 100% of Umbro China. As described above, the Company completed the sale of Umbro China in July 2020.

[2] As described above, the Company completed the sale of Starter China in September, 2020. As a result of this transaction, the Company recognized a gain of $14.5 million, which has been recorded within Operating Income in the Company’s condensed consolidated statement of operations during the Current Quarter.

[3] On June 30, 2020, the Company sold a 10% interest in Danskin China Ltd. to Li Ning Sports (Hong Kong) Company Ltd for $1.6 million.

[4] In June 2018, the Company entered into an agreement with POS Lee Cooper HK Co. Ltd. (“PLC”) to sell up to no less than a 50% interest and up to a total of 60% interest in its wholly-owned indirect subsidiary, Lee Cooper China Limited, a newly registered Hong Kong subsidiary of Iconix China (“Lee Cooper China”), and which will hold the Lee Cooper trademarks and related assets in respect of the Greater China territory. PLC’s purchase of the initial 50% equity interest in Lee Cooper China is expected to occur annually over a four-year period commencing within 45 days of October 15, 2020, for cash consideration of approximately $8.2 million. The additional 10% equity interest (for a total equity interest of 60% interest) purchase right of PLC is expected to occur over a two-year period commencing January 15, 2024 for cash consideration equal to the greater of $2.5 million or 2.5 times the royalty received under the respective license agreement in the previous twelve months based on other terms and conditions specified in the share purchase agreement.